CHLORIDES IX IJATX 



21 



amount falls and rises in the intermediate months with 

 considerable regularity, the only l)reak occurring in tlie 

 March rain, which contains more c^hlorinc than the rain 

 ftilling in February. The total chlorine is equivalent to 2;')-:} lb 

 of common salt per acre per annum. Of this amount, 170 11). 

 is contributed by the rain falling from October to March, and 



Table VJ II. — Comparison of Maxiynum and Minimum 

 Precipitation of Rain and Chlorine. 



the rest (8-3 lb.) by the spring and summer rains (April to 

 September). This difference is all the more striking as 

 the rainfall of the two six-monthly periods is almost the same. 



The yearly amounts of chlorine per acre vary considerably, 

 and the variations depend more on the distribution of the 

 rainfall during the year than on the total fall. 



No recent determinations of sulphuric acid in rain-water 



Table IX. — Sulphuric Acid and Chlorine in Rain-water <ollertcd at 

 Rothamsted. 



have been made at Rothamsted, but a summary of the results 

 obtained in 1881-7 is given here to complete the record. 



Keference to the Table {IX. ) will show that the rain 



